skins/sam/resize-base-skin.css

.yui3-resize-handle-inner-r,
.yui3-resize-handle-inner-l,
.yui3-resize-handle-inner-t,
.yui3-resize-handle-inner-b,
.yui3-resize-handle-inner-tr,
.yui3-resize-handle-inner-br,
.yui3-resize-handle-inner-tl,
.yui3-resize-handle-inner-bl {
    background-repeat: no-repeat;
    background: url(arrows.png) no-repeat 0 0;
    display: block;
    height: 15px;
    overflow: hidden;
    text-indent: -99999em;
    width: 15px;
}

.yui3-resize-handle-inner-br {
    background-position: -30px 0;
    bottom: -2px;
    right: -2px;
}

.yui3-resize-handle-inner-tr {
    background-position: -58px 0;
    bottom: 0;
    right: -2px;

}

.yui3-resize-handle-inner-bl {
    background-position: -75px 0;
    bottom: -2px;
    right: -2px;
}

.yui3-resize-handle-inner-tl {
    background-position: -47px 0;
    bottom: 0;
    right: -2px;

}

.yui3-resize-handle-inner-b,.yui3-resize-handle-inner-t {
    background-position: -15px 0;
}